Stereoselective allylation of chiral monoperoxyacetals
摘要:
Neighboring iodo-, alkoxy-, acetoxy- and silyl groups impart useful levels of diastereoselection in the Lewis acid-mediated allylation of monoperoxyacetals. Although monoperoxyacetals are found to be considerably less reactive than corresponding nonperoxidic acetals, similar stereochemical trends are observed in the two series. (c) 2005 Elsevier Ltd. All rights reserved.
Highly stereoselective access to 2,4- and 2,4,5-substituted tetrahydrofurans from α-silylacetic esters. A study of homoallylic stereocontrol.
摘要:
Cis-2,4- and cis-cis-2,4,5-substituted tetrahydrofurans have been prepared stereoselectively using electrophile-mediated cyclization of beta-hydroxyhomoallylsilanes, readily available from alpha-silylacetic esters.